Pain in any area of Urino-Genito tract for which no visual or bacterial test shows positive can be a sign of Collinitis (moderate or mild even). Chronic inflammation or infection of the lower bowel...
I have two children and with both i expienced some cramping. My Dr. called them growing pains. It all depends on how far along you are and how bad the cramps hurt. you may want to get an ultrasound...